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Ds\Deque::shift

(PECL ds >= 1.0.0)

Ds\Deque::shiftRemoves and returns the first value

说明

public mixed Ds\Deque::shift ( void )

Removes and returns the first value.

参数

此函数没有参数。

返回值

The first value, which was removed.

错误/异常

UnderflowException if empty.

范例

Example #1 Ds\Deque::shift() example

<?php
$deque 
= new \Ds\Deque(["a""b""c"]);

var_dump($deque->shift());
var_dump($deque->shift());
var_dump($deque->shift());
?>

以上例程的输出类似于:

string(1) "a"
string(1) "b"
string(1) "c"
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